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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a0690a69fb06d5cc8fd694a9a1456e6b991866e0c34201d4416e847d99fd48' 
  AND token = 'ExhwYEKwJIuzfI7y8i8kUR1Y5m09OTvTToY85unbuLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}